Choose the correct variant. 1) Could / May / Shall you tell me where the post office is, please? – Certainly. It’s down the street on the right.
2) You mustn’t / needn’t / couldn’t vacuum the carpet. – Oh, have you done it already?
3) Are you free on Saturday morning? – No, I have to / can / shall go into the office for a couple of hours?
4) Shall / Will / Would I get you a glass of water from the kitchen? – Yes, please. And may / could / shall you put some ice in it, too?
5) I want to pass the driving test this year. – You didn’t need to / should / needn’t take some more lessons.
6) Can / Shall / Would I have some ice cream, please? – Yes, of course. What flavor would you like?
7) Where’s Frank? Is he usually late? – Not at all. He ought / must / need to be here by now.
8) I threw your old books into the recycling bin. – Oh, no! You mustn’t / shouldn’t / can’t have done that. I need some of them for school.
9) Mary must / had to / ought to leave the meeting early because she had a train to catch.
10) What you must / should / needn’t have done was to call the police, not get involved yourself.
11) I will / could be able to / will be able to speak better if I practise more.
12) I didn’t need to / can’t / wasn’t able to get tickets after all – they were sold out.

1) Could you tell me where the post office is, please? – Certainly. It’s down the street on the right.
Explanation: The correct variant is "Could" since it is used to make a polite request.

2) You needn’t vacuum the carpet. – Oh, have you done it already?
Explanation: The correct variant is "needn’t" as it means it is not necessary to vacuum the carpet as it has already been done.

3) Are you free on Saturday morning? – No, I have to go into the office for a couple of hours.
Explanation: The correct variant is "have to" as it expresses an obligation to go into the office.

4) Shall I get you a glass of water from the kitchen? – Yes, please. And could you put some ice in it, too?
Explanation: The correct variant is "Shall" as it is used to make an offer, and "could" is used to ask for a favor politely.

5) I want to pass the driving test this year. – You should take some more lessons.
Explanation: The correct variant is "should" as it gives advice or suggestion to take more lessons.

6) Can I have some ice cream, please? – Yes, of course. What flavor would you like?
Explanation: The correct variant is "Can" as it is used to make a polite request for ice cream.

7) Where’s Frank? Is he usually late? – Not at all. He ought to be here by now.
Explanation: The correct variant is "ought to" as it indicates that it is expected for Frank to be here by now.

8) I threw your old books into the recycling bin. – Oh, no! You shouldn’t have done that. I need some of them for school.
Explanation: The correct variant is "shouldn’t have" as it expresses regret or disapproval for throwing the books into the recycling bin.

9) Mary had to leave the meeting early because she had a train to catch.
Explanation: The correct variant is "had to" as it indicates an obligation or necessity to leave the meeting early.

10) What you should have done was to call the police, not get involved yourself.
Explanation: The correct variant is "should" as it suggests that calling the police was the correct action to take.

11) I will be able to speak better if I practice more.
Explanation: The correct variant is "will be able to" as it indicates the future ability to speak better with more practice.

12) I didn’t need to get tickets after all – they were sold out.
Explanation: The correct variant is "didn't need to" as it indicates that it was not necessary to get tickets since they were sold out.